Ragalytė, Birutė, and Alma Paukštienė. “The Notion Numerical Growth in Mathematics Textbooks and Periodic Publications Between Two Word Wars”. Lietuvos matematikos rinkinys 50, no. proc. LMS (December 20, 2009): 160–165. Accessed May 3, 2024. https://www.journals.vu.lt/LMR/article/view/17921.